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Formation of defects in the graphite oxidization process: a positron study

文献类型： 外文期刊

作者： Gong, Wei 1 ; He, Dongning 1 ; Tao, Jinlong 1 ; Zhao, Pengfei 1 ; Kong, Lingxue 2 ; Luo, Yongyue 1 ; Peng, Zheng 1 ; Wang 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Agr Product Proc Res Inst, Chinese Agr Minist Key Lab Trop Crop Prod Process, Zhanjiang 524001, Peoples R China

2.Deakin Univ, Inst Frontier Mat, Waurn Ponds, Vic 3216, Australia

3.Univ So Queensland, Ctr Excellence Engn Fibre Composites, Toowoomba, Qld 4350, Australia

4.Univ So Queensland, Ctr Exce

期刊名称：RSC ADVANCES （ 影响因子：3.361； 五年影响因子：3.39 ）

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收录情况： SCI

摘要： High-resolution positron annihilation lifetime (PAL) and two-detector coincidence Doppler broadening of annihilation radiation (2D-DBAR) measurements on graphite and its oxide derivatives for defect information, differing in oxidization agents, are reported. Positron measurements were found to be very effective in the investigation of defects in graphite and its derivatives. Positrons are mainly annihilated in vacancy-like defects on the particle surface and in large open-volume holes associated with the interface of graphite and graphite oxide. Different types of defects have been detected for unexfoliated graphite oxide and exfoliated graphene oxide based on 2D-DBAR measurements, namely the vacancy cluster and vacancy-oxygen complexes. It is also interesting to observe that the calculated large open-volume diameter of graphene oxide coincides with the distance between the layers from the XRD investigation, which indicates that the annihilation of the long-lived lifetime component tau(3) might take place in the area between the graphene layers; no large open-volume hole has been detected.

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